Fans arrive for the Oakland Raiders' preseason game at O.co Coliseum in Oakland, Calif., on Sunday, Aug. 30, 2015.

Fans arrive for the Oakland Raiders' preseason game at O.co Coliseum in Oakland, Calif., on Sunday, Aug. 30, 2015.

Photo: Scott Strazzante, The Chronicle

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OAKLAND, CA - NOVEMBER 09: A general view of the exterior of the O.co Coliseum prior to the start of an NFL football game between the Denver Broncos and Oakland Raiders on November 9, 2014 in Oakland, California. less

OAKLAND, CA - NOVEMBER 09: A general view of the exterior of the O.co Coliseum prior to the start of an NFL football game between the Denver Broncos and Oakland Raiders on November 9, 2014 in Oakland, ... more

Photo: Thearon W. Henderson, Getty Images

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In this Dec. 24, 2015, O.co Coliseum is reflected in a puddle before an NFL football game between the Oakland Raiders and the San Diego Chargers in Oakland, Calif.(AP Photo/Jeff Chiu, File)

In this Dec. 24, 2015, O.co Coliseum is reflected in a puddle before an NFL football game between the Oakland Raiders and the San Diego Chargers in Oakland, Calif.(AP Photo/Jeff Chiu, File)

Photo: Jeff Chiu, Associated Press

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O.co drops out; stadium is back to just Oakland Coliseum

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O.co is no longer the name on the Oakland Coliseum.

Online retailer Overstock.com had opted out of the naming-rights agreement as of Saturday, said Catherine Aker, a spokeswoman for the A’s. Overstock.com will maintain its corporate sponsorship agreement with the baseball team, including stadium signage.

“They’ve always been able to terminate the contract if they wanted,” McKibben said. “Like a lot of corporations, they sit back and look at their sponsorships and marketing efforts and came to the conclusion they wanted to go in another direction. They have been at this for five or six years.”